package main

import (
	"fmt"
	"os"
	"strings"
	"tildegit.org/sloum/spreadsheet/termios"
)

const (
	Left          rune = 'h'
	Right         rune = 'l'
	Up            rune = 'k'
	Down          rune = 'j'
	Quit          rune = 'Q'
	Edit          rune = '\n'
	EditAlt       rune = ' '
	Del           rune = 'd'
	Com           rune = ':'
	ZoomIn        rune = '+'
	ZoomOut       rune = '-'
	Yank          rune = 'y'
	Paste         rune = 'p'
	PasteRelative rune = 'P'
	ToTop         rune = 'g'
	ToBottom      rune = 'G'
	RowStart      rune = '^'
	RowEnd        rune = '$'
)

type workbook struct {
	name      string
	path      string
	sheets    []sheet
	sheet     int
	termRows  int
	termCols  int
}

func (w workbook) Draw() {
	fmt.Print("\033[0;0H")
	fmt.Printf("FILE: \033[1m%-*.*s\033[0m\n", w.termCols-6, w.termCols-6, w.path)
	fmt.Printf("EXPR: %-*.*s\n",
						 w.termCols-6, w.termCols-6,
						 w.sheets[w.sheet].CurrentValue(true))
	w.sheets[w.sheet].Draw(w.termCols,w.termRows)
}

func (w *workbook) Run() {
	defer termios.Restore()
	termios.SetCharMode()
	fmt.Print("\033[?25l\033[2J")
	var input rune
	for {
		w.Draw()
		input = Getch()
		switch input {
		case Left, Right, Up, Down, ToTop, RowStart, ToBottom, RowEnd:
			w.sheets[w.sheet].moveSelection(input, w.termRows)
		case Quit:
			termios.Restore()
			fmt.Print("\033[?25h")
			os.Exit(0)
		case Edit, EditAlt:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].Edit(w.sheets[w.sheet].selection.row, w.sheets[w.sheet].selection.col)
			w.sheets[w.sheet].Recalculate()
		case Del:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1] = cell{}
			w.sheets[w.sheet].Recalculate()
		case Com:
			line, err := GetLine(":")
			if err != nil {
				panic(err)
			}
			runCommand(strings.Fields(line))
		case ZoomIn:
			w.sheets[w.sheet].ZoomIn()
			fmt.Print("\033[2J")
		case ZoomOut:
			w.sheets[w.sheet].ZoomOut()
			fmt.Print("\033[2J")
		case Yank:
			w.sheets[w.sheet].Yank()
		case Paste:
			w.sheets[w.sheet].Paste()
			w.sheets[w.sheet].Recalculate()
		case PasteRelative:
			w.sheets[w.sheet].PasteRelative()
			w.sheets[w.sheet].Recalculate()
		}
	}
}

func makeWorkbook(path string) workbook {
	// TODO parse path and get file name
	// set name of strict to the filename
	// or untitled.qsh if no filename; set
	// path to the full path
	cols, rows := termios.GetWindowSize()
	sh := makeSheet("Sheet1")
	wb = workbook{path, path, make([]sheet,1), 0, rows, cols}
	wb.sheets[0] = sh
	return wb
}

func (w workbook) header() string {
	return fmt.Sprintf("\033[1;7m %s \033[0m %s\n",w.name, w.sheets[w.sheet].name)
}